Flight Check

Best Airline: MIA to ATL

Miami to Atlanta — airline reliability comparison

Southwest Airlines is the most reliable airline on the MIA to ATL route with a 80% on-time rate, compared to Frontier Airlines at 65%. Based on 1,633 flights tracked.

This route involves high-congestion airports, which can affect reliability regardless of airline.

Source: Bureau of Transportation Statistics. Updated October 2026.

On-Time Rate by Airline

Southwest Airlines80%
80%
Spirit Airlines75%
Delta Air Lines74%
American Airlines67%
Frontier Airlines65%

MIA to ATL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Southwest AirlinesWNBest80%0.8%59m1,633
MQ80%0.8%51m595
Spirit AirlinesNK75%1.9%77m1,124
Delta Air LinesDL74%1.1%80m11,543
American AirlinesAA67%1.2%82m6,081
Frontier AirlinesF9Worst65%2.5%78m2,399

Route Overview

72%
Overall On-Time
79m
Avg Delay
1.3%
Cancel Rate
23,516
Total Flights
MIA to ATL Route DetailsReturn: ATL to MIA
MIA AirportATL Airport

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Data last updated October 2026. Source: Bureau of Transportation Statistics.